<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<title></title>
	<style type="text/css">
		.box{
			width: 400px;
			height: 400px;
			margin: 50px auto;
			display: flex;
			flex-wrap: wrap;
			transition: all 3s;
			transform: rotate(25deg);
		}
		.box div{
			width: 0;
			height: 0;
			border: 100px solid skyblue;
			
		}
		.box div:nth-child(1){
			border-color: transparent transparent skyblue transparent;
		}
		.box div:nth-child(2){
			border-color: transparent transparent transparent skyblue;
		}
		.box div:nth-child(3){
			border-color: transparent skyblue transparent transparent;
		}
		.box div:nth-child(4){
			border-color: skyblue transparent transparent transparent;
		}
		.box:hover{
			transform: rotate(1200deg);
		}
	</style>
</head>
<body>
	<div class="box">
	<div ></div>
	<div ></div>
	<div ></div>
	<div ></div>
	</div>
</body>
</html>